Answer:
Serbian nationalism is what caused war
Explanation:
nationalism in a whole started coming into play during the 1860s and would lead to the formation of a German state known as the German Empire It also unified separate Balkan states under nationalities like Bulgaria, Greece, Serbia, Romania, ect.
If you are referring to the United States, the answer is probably the Vietnam War.
<span>Una de las principales razones fue el comienzo de la era Industrial, que trajo una repentina oleada de inmigración.</span>
The reason the Spanish established missions were to spread region into a new region. Hope this helps, good luck.